Drilling with Cased Continuous Flight Auger (CCFA)

Drilling with Cased Continuous Flight Auger is one of the single-pass drilling techniques. During the drilling process, a continuous flight auger protected by a counter-rotating casing string conveys the drill spoil to the surface. Concrete is subsequently poured through the hollow stem of the auger. With drilling diameters of up to 600 mm, FOW counts as one of the CCFA drilling techniques.